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OK, false alarm. The reason the switch was not working is precisely because the digital storage board main connector wasn't connected! A14 gets a 5V5 feed looped via the A16 Digital Storage Board,

When I put together a kit of parts to make 7k flex extenders, I measured 40 plugins and got an idea of the tolerances and had some made by a requested mod to a Taiwanese connector. A standard

Yes. I thought I remembered reading a post from Dennis talking about this but I was not able craft a search to find the thread. I'm a little worried that the main body of the connector, the comb

I realize that this is off topic, but: Does anyone reading this use either an Ailtech 460 signal generator or the Adret 7100 version...? I have a couple of questions I need answers to before I can

Yup, it shows a ripply, moving wave when i touch my finger to it...I can never get it to be static though (even the square scrolls). So it sounds like it's basically working, huh? I don't get why the

Hey Bernd, Congrats on the fix. Was your mode of diagnosis purely digital (fingers), or were there specific signals or test points that pointed you in the

You have to realize that virtually all contact pressure in those connectors comes from the plastic covers; unsolder the connector, remove the cover and all contacts will land on the

Jeff try Walter at Sphère Research in Canada, he may have the connectors or a spare 7xxx backplane Jon

Hello Barry, Metal film could be better, I agree, and I am not committed to carbon film. As I recall, carbon comp had lower inductance than the other two types, but of course they can drift in

Jeff, You probably already know this but a word of caution. The fingers in that connector are very easily bent. The mid-board trace for one of the fingers in the left vertical slot in my 7704A

David, that is EXACTLY what I need, and it may explain why one of the remaining slots (B HORIZ) is not working properly: it looks like the lower half of the A cover plate is loose, which is causing

In case anyone nearby and interested. It just hit craigslist yesterday. Looks like a good buy. https://portland.craigslist.org/wsc/ele/d/newberg-tektronix-475-oscilloscopes/7464954073.html

Just curios why a carbon film. Wouldn't metal film be as good or, possibly, a better choice for stability, etc.? Thanks, Barry - N4BUQ

Clark - that's the one. It's a 9V AC plugged into the wall

David - yeah, I have the ground plugged into where the tutorial shows. I've used both the 1x and 10x probe that came with the scope. For reference, here's the tutorial: The behavior your describe

The behavior your describe where the line "bounces" up is what happens. With the variable voltage knob on the generator, the line will ease up and down as I turn it. Maybe it IS working then? I

Thanks Ozan -- I will look into R1003 and 3F? too. The last time I checked (a while ago) all of the power supply voltages were good. But when I open it back up I will double-check. Except for the

Hello Mark, Thanks for the advice -- I will try it soon. I will probably put in 1/4W 1% carbon film to replace the broken ones. That might be over-kill, but the cost difference should be small. I

All you probably need is replacements for the plastic bits that clip onto the sides of the sockets. Without those the contacts won't make contact - at least not consistently. AFAIK they are only

Jeff the 1970s..1980s plastics loose plasticisers and become brittle and crumble, PCB edgemand Tektronix "harmonica" inline PCB cables. 3D printer do not give an accurate reproduction at such fine